blob: 05b19f70bf97efdd47872566e15e6638c41aa1b7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (c) 2000-2001 Christoph Hellwig.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions, and the following disclaimer,
10 * without modification.
11 * 2. The name of the author may not be used to endorse or promote products
12 * derived from this software without specific prior written permission.
13 *
14 * Alternatively, this software may be distributed under the terms of the
15 * GNU General Public License ("GPL").
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Veritas filesystem driver - fileset header routines.
32 */
33#include <linux/fs.h>
34#include <linux/buffer_head.h>
35#include <linux/kernel.h>
36#include <linux/slab.h>
37#include <linux/string.h>
38
39#include "vxfs.h"
40#include "vxfs_inode.h"
41#include "vxfs_extern.h"
42#include "vxfs_fshead.h"
43
44
45#ifdef DIAGNOSTIC
46static void
47vxfs_dumpfsh(struct vxfs_fsh *fhp)
48{
49 printk("\n\ndumping fileset header:\n");
50 printk("----------------------------\n");
51 printk("version: %u\n", fhp->fsh_version);
52 printk("fsindex: %u\n", fhp->fsh_fsindex);
53 printk("iauino: %u\tninodes:%u\n",
54 fhp->fsh_iauino, fhp->fsh_ninodes);
55 printk("maxinode: %u\tlctino: %u\n",
56 fhp->fsh_maxinode, fhp->fsh_lctino);
57 printk("nau: %u\n", fhp->fsh_nau);
58 printk("ilistino[0]: %u\tilistino[1]: %u\n",
59 fhp->fsh_ilistino[0], fhp->fsh_ilistino[1]);
60}
61#endif
62
63/**
64 * vxfs_getfsh - read fileset header into memory
65 * @ip: the (fake) fileset header inode
66 * @which: 0 for the structural, 1 for the primary fsh.
67 *
68 * Description:
69 * vxfs_getfsh reads either the structural or primary fileset header
70 * described by @ip into memory.
71 *
72 * Returns:
73 * The fileset header structure on success, else Zero.
74 */
75static struct vxfs_fsh *
76vxfs_getfsh(struct inode *ip, int which)
77{
78 struct buffer_head *bp;
79
80 bp = vxfs_bread(ip, which);
81 if (buffer_mapped(bp)) {
82 struct vxfs_fsh *fhp;
83
84 if (!(fhp = kmalloc(sizeof(*fhp), SLAB_KERNEL)))
85 return NULL;
86 memcpy(fhp, bp->b_data, sizeof(*fhp));
87
88 brelse(bp);
89 return (fhp);
90 }
91
92 return NULL;
93}
94
95/**
96 * vxfs_read_fshead - read the fileset headers
97 * @sbp: superblock to which the fileset belongs
98 *
99 * Description:
100 * vxfs_read_fshead will fill the inode and structural inode list in @sb.
101 *
102 * Returns:
103 * Zero on success, else a negative error code (-EINVAL).
104 */
105int
106vxfs_read_fshead(struct super_block *sbp)
107{
108 struct vxfs_sb_info *infp = VXFS_SBI(sbp);
109 struct vxfs_fsh *pfp, *sfp;
110 struct vxfs_inode_info *vip, *tip;
111
112 vip = vxfs_blkiget(sbp, infp->vsi_iext, infp->vsi_fshino);
113 if (!vip) {
114 printk(KERN_ERR "vxfs: unabled to read fsh inode\n");
115 return -EINVAL;
116 }
117 if (!VXFS_ISFSH(vip)) {
118 printk(KERN_ERR "vxfs: fsh list inode is of wrong type (%x)\n",
119 vip->vii_mode & VXFS_TYPE_MASK);
120 goto out_free_fship;
121 }
122
123
124#ifdef DIAGNOSTIC
125 printk("vxfs: fsh inode dump:\n");
126 vxfs_dumpi(vip, infp->vsi_fshino);
127#endif
128
129 infp->vsi_fship = vxfs_get_fake_inode(sbp, vip);
130 if (!infp->vsi_fship) {
131 printk(KERN_ERR "vxfs: unabled to get fsh inode\n");
132 goto out_free_fship;
133 }
134
135 sfp = vxfs_getfsh(infp->vsi_fship, 0);
136 if (!sfp) {
137 printk(KERN_ERR "vxfs: unabled to get structural fsh\n");
138 goto out_iput_fship;
139 }
140
141#ifdef DIAGNOSTIC
142 vxfs_dumpfsh(sfp);
143#endif
144
145 pfp = vxfs_getfsh(infp->vsi_fship, 1);
146 if (!pfp) {
147 printk(KERN_ERR "vxfs: unabled to get primary fsh\n");
148 goto out_free_sfp;
149 }
150
151#ifdef DIAGNOSTIC
152 vxfs_dumpfsh(pfp);
153#endif
154
155 tip = vxfs_blkiget(sbp, infp->vsi_iext, sfp->fsh_ilistino[0]);
156 if (!tip)
157 goto out_free_pfp;
158
159 infp->vsi_stilist = vxfs_get_fake_inode(sbp, tip);
160 if (!infp->vsi_stilist) {
161 printk(KERN_ERR "vxfs: unabled to get structual list inode\n");
162 kfree(tip);
163 goto out_free_pfp;
164 }
165 if (!VXFS_ISILT(VXFS_INO(infp->vsi_stilist))) {
166 printk(KERN_ERR "vxfs: structual list inode is of wrong type (%x)\n",
167 VXFS_INO(infp->vsi_stilist)->vii_mode & VXFS_TYPE_MASK);
168 goto out_iput_stilist;
169 }
170
171 tip = vxfs_stiget(sbp, pfp->fsh_ilistino[0]);
172 if (!tip)
173 goto out_iput_stilist;
174 infp->vsi_ilist = vxfs_get_fake_inode(sbp, tip);
175 if (!infp->vsi_ilist) {
176 printk(KERN_ERR "vxfs: unabled to get inode list inode\n");
177 kfree(tip);
178 goto out_iput_stilist;
179 }
180 if (!VXFS_ISILT(VXFS_INO(infp->vsi_ilist))) {
181 printk(KERN_ERR "vxfs: inode list inode is of wrong type (%x)\n",
182 VXFS_INO(infp->vsi_ilist)->vii_mode & VXFS_TYPE_MASK);
183 goto out_iput_ilist;
184 }
185
186 return 0;
187
188 out_iput_ilist:
189 iput(infp->vsi_ilist);
190 out_iput_stilist:
191 iput(infp->vsi_stilist);
192 out_free_pfp:
193 kfree(pfp);
194 out_free_sfp:
195 kfree(sfp);
196 out_iput_fship:
197 iput(infp->vsi_fship);
198 return -EINVAL;
199 out_free_fship:
200 kfree(vip);
201 return -EINVAL;
202}